dnl #
dnl # 2.6.35 API change,
dnl # The 'struct xattr_handler' was constified in the generic
dnl # super_block structure.
dnl #
AC_DEFUN([ZFS_AC_KERNEL_CONST_XATTR_HANDLER],
	[AC_MSG_CHECKING([whether super_block uses const struct xattr_hander])
	ZFS_LINUX_TRY_COMPILE([
		#include <linux/fs.h>
		#include <linux/xattr.h>

		const struct xattr_handler xattr_test_handler = {
			.prefix	= "test",
			.get	= NULL,
			.set	= NULL,
		};

		const struct xattr_handler *xattr_handlers[] = {
			&xattr_test_handler,
		};

		const struct super_block sb __attribute__ ((unused)) = {
			.s_xattr = xattr_handlers,
		};
	],[
	],[
		AC_MSG_RESULT([yes])
		AC_DEFINE(HAVE_CONST_XATTR_HANDLER, 1,
		          [super_block uses const struct xattr_hander])
	],[
		AC_MSG_RESULT([no])
	])
])

dnl #
dnl # 2.6.33 API change,
dnl # The xattr_hander->get() callback was changed to take a dentry
dnl # instead of an inode, and a handler_flags argument was added.
dnl #
dnl # 4.4 API change,
dnl # The xattr_hander->get() callback was changed to take a xattr_handler,
dnl # and handler_flags argument was removed and should be accessed by
dnl # handler->flags.
dnl #
AC_DEFUN([ZFS_AC_KERNEL_XATTR_HANDLER_GET], [
	AC_MSG_CHECKING([whether xattr_handler->get() wants dentry])
	ZFS_LINUX_TRY_COMPILE([
		#include <linux/xattr.h>

		int get(struct dentry *dentry, const char *name,
		    void *buffer, size_t size, int handler_flags) { return 0; }
		static const struct xattr_handler
		    xops __attribute__ ((unused)) = {
			.get = get,
		};
	],[
	],[
		AC_MSG_RESULT(yes)
		AC_DEFINE(HAVE_DENTRY_XATTR_GET, 1,
		    [xattr_handler->get() wants dentry])
	],[
		AC_MSG_RESULT(no)
		AC_MSG_CHECKING([whether xattr_handler->get() wants xattr_handler])
		ZFS_LINUX_TRY_COMPILE([
			#include <linux/xattr.h>

			int get(const struct xattr_handler *handler, struct dentry *dentry,
			    const char *name, void *buffer, size_t size) { return 0; }
			static const struct xattr_handler
			    xops __attribute__ ((unused)) = {
				.get = get,
			};
		],[
		],[
			AC_MSG_RESULT(yes)
			AC_DEFINE(HAVE_HANDLER_XATTR_GET, 1,
			    [xattr_handler->get() wants xattr_handler])
		],[
			AC_MSG_RESULT(no)
		])
	])
])

dnl #
dnl # 2.6.33 API change,
dnl # The xattr_hander->set() callback was changed to take a dentry
dnl # instead of an inode, and a handler_flags argument was added.
dnl #
dnl # 4.4 API change,
dnl # The xattr_hander->set() callback was changed to take a xattr_handler,
dnl # and handler_flags argument was removed and should be accessed by
dnl # handler->flags.
dnl #
AC_DEFUN([ZFS_AC_KERNEL_XATTR_HANDLER_SET], [
	AC_MSG_CHECKING([whether xattr_handler->set() wants dentry])
	ZFS_LINUX_TRY_COMPILE([
		#include <linux/xattr.h>

		int set(struct dentry *dentry, const char *name,
		    const void *buffer, size_t size, int flags,
		    int handler_flags) { return 0; }
		static const struct xattr_handler
		    xops __attribute__ ((unused)) = {
			.set = set,
		};
	],[
	],[
		AC_MSG_RESULT(yes)
		AC_DEFINE(HAVE_DENTRY_XATTR_SET, 1,
		    [xattr_handler->set() wants dentry])
	],[
		AC_MSG_RESULT(no)
		AC_MSG_CHECKING([whether xattr_handler->set() wants xattr_handler])
		ZFS_LINUX_TRY_COMPILE([
			#include <linux/xattr.h>

			int set(const struct xattr_handler *handler, struct dentry *dentry,
			    const char *name, const void *buffer, size_t size, int flags) { return 0; }
			static const struct xattr_handler
			    xops __attribute__ ((unused)) = {
				.set = set,
			};
		],[
		],[
			AC_MSG_RESULT(yes)
			AC_DEFINE(HAVE_HANDLER_XATTR_SET, 1,
			    [xattr_handler->set() wants xattr_handler])
		],[
			AC_MSG_RESULT(no)
		])
	])
])

dnl #
dnl # 2.6.33 API change,
dnl # The xattr_hander->list() callback was changed to take a dentry
dnl # instead of an inode, and a handler_flags argument was added.
dnl #
dnl # 4.4 API change,
dnl # The xattr_hander->list() callback was changed to take a xattr_handler,
dnl # and handler_flags argument was removed and should be accessed by
dnl # handler->flags.
dnl #
AC_DEFUN([ZFS_AC_KERNEL_XATTR_HANDLER_LIST], [
	AC_MSG_CHECKING([whether xattr_handler->list() wants dentry])
	ZFS_LINUX_TRY_COMPILE([
		#include <linux/xattr.h>

		size_t list(struct dentry *dentry, char *list, size_t list_size,
		    const char *name, size_t name_len, int handler_flags)
		    { return 0; }
		static const struct xattr_handler
		    xops __attribute__ ((unused)) = {
			.list = list,
		};
	],[
	],[
		AC_MSG_RESULT(yes)
		AC_DEFINE(HAVE_DENTRY_XATTR_LIST, 1,
		    [xattr_handler->list() wants dentry])
	],[
		AC_MSG_RESULT(no)
		AC_MSG_CHECKING([whether xattr_handler->list() wants xattr_handler])
		ZFS_LINUX_TRY_COMPILE([
			#include <linux/xattr.h>

			size_t list(const struct xattr_handler *handler, struct dentry *dentry,
			    char *list, size_t list_size, const char *name, size_t name_len) { return 0; }
			static const struct xattr_handler
			    xops __attribute__ ((unused)) = {
				.list = list,
			};
		],[
		],[
			AC_MSG_RESULT(yes)
			AC_DEFINE(HAVE_HANDLER_XATTR_LIST, 1,
			    [xattr_handler->list() wants xattr_handler])
		],[
			AC_MSG_RESULT(no)
		])
	])
])

dnl #
dnl # 3.7 API change,
dnl # The posix_acl_{from,to}_xattr functions gained a new
dnl # parameter: user_ns
dnl #
AC_DEFUN([ZFS_AC_KERNEL_POSIX_ACL_FROM_XATTR_USERNS], [
	AC_MSG_CHECKING([whether posix_acl_from_xattr() needs user_ns])
	ZFS_LINUX_TRY_COMPILE([
		#include <linux/cred.h>
		#include <linux/fs.h>
		#include <linux/posix_acl_xattr.h>
	],[
		posix_acl_from_xattr(&init_user_ns, NULL, 0);
	],[
		AC_MSG_RESULT(yes)
		AC_DEFINE(HAVE_POSIX_ACL_FROM_XATTR_USERNS, 1,
		    [posix_acl_from_xattr() needs user_ns])
	],[
		AC_MSG_RESULT(no)
	])
])